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ATRAC: Adaptive Transform Acoustic Coding for MiniDisc
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ATRAC: Adaptive Transform Acoustic Coding for MiniDisc Sony Corporate Research Laboratories 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141 Japan Reprinted from the 93rd Audio Engineering Society Convention in San Fransisco, 1992 October 1-4 Abstract ATRAC is an audio coding system based on psychoacoustic principles. The input signal is divided into three subbands which are then transformed into the frequency domain using a variable block length. Transform coefficients are grouped into nonuniform bands to reflect the human auditory system, and then quantized on the basis of dynamic sensitivity and masking characteristics. ATRAC compresses compact disc audio to approximately 1/5 of the original data rate with virtually no loss in sound quality. 1 Introduction Recently, there has been an increasing consumer demand for a portable recordable high-quality digital audio media. The MiniDisc system was developed to meet this demand. The MiniDisc is based on a 64 mm optical or magneto-optical disc which has approximately 1/5 of the data...
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